问题补充：
Everyone of us it’s important a seat belt in the car.
A. knows, wears
B. know, to wear
C. knows, to wear
D. know, wearing
答案：
A. knows, wears
B. know, to wear
(答案→)C. knows, to wear
D. know, wearing
解析：everyone of sb 作为主语，相当于三单形式，故用动词的三单形式，而后一空属于固定句型，即it’s +adj+for sb to do sth，故选答案为C
